/Engine/Source/Runtime/Engine/Public/Net/Util/SequenceNumber.h
Diff between sequence numbers (A - B) only valid if (A - B) < SeqNumberHalf
static [DifferenceT](API\Runtime\Engine\Net\Util\TSequenceNumber\DifferenceT) Diff ( [TSequenceNumber](API\Runtime\Engine\Net\Util\TSequenceNumber) A, [TSequenceNumber](API\Runtime\Engine\Net\Util\TSequenceNumber) B )